Belgrade , Serbia -LRB- CNN -RRB- -- A gunman went on a shooting spree in the Serbian town of Velika Ivanca on Tuesday , killing at least 13 people , including a small child , according to Police Chief Milorad Veljovic .

The town lies roughly 25 miles south of the capital , Belgrade .

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The man , in his 60s , entered five houses and shot six men , six women and one child dead .

Twelve of the victims died immediately , another died at a Belgrade hospital , Serbian news agency Tanjug reported . Two people remained hospitalized , one of them likely the suspected shooter , Tanjug reported , citing Veljovic .

Veljovic said the gunman attempted to kill his wife and take his own life , according to Tanjug .

It was not immediately clear whether the man 's wife survived .

Investigators do n't know what sparked the killings , Veljovic said .

Serbian broadcaster B92 described the man as a veteran of the Serbian-Croatian war in the 1990s who had lost his job a year ago . Neighbors said the man had never seemed violent , B92 reported .

Serbia has a low murder rate , nearly on par with that of Sweden , according to the World Health Organization . With 1.2 intentional homicides per 100,000 inhabitants in 2010 , Serbia 's murder rate was one-quarter of that of the United States .

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NEW : The shooting suspect is a war veteran who never seemed violent , a broadcaster reports

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The man goes house to house , killing occupants ; six women , six men and one child die

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Murder is rare in Serbia , according to the World Health Organization